[e.cash] Create Use eCash page

Summary:
Include some highlighted projects
Move services to that page

Depends on D16172

T3516

Test Plan: Run it locally and click around

Reviewers: #bitcoin_abc, bytesofman

Reviewed By: #bitcoin_abc, bytesofman

Subscribers: bytesofman, Kronkmeister

Differential Revision: https://reviews.bitcoinabc.org/D15966